The placenta develops from the outer cells of the

Planets in our solar system travel in their own orbital paths around the Sun. What causes the planets to continuously orbit the Sun instead of floating away into space? A) Not enough room is available in space for planets to float freely.

Nucleic acids and carbohydrates are both types of what? A. Elements B. Atoms C. Proteins D. Macromolecules

Which of the following is a convection from chemical energy and thermal energy A. coal is burned to heat water B. All of the options are correct C. charcoal is burned in a barbecue pit D. food is digested and used to regulate body temperatures

Which of the following correctly identifies the purpose of the ribosomes? A: Ribosomes are responsible for the cell division B: Ribosomes contain all the genetic material found in the cell C: Ribosomes are where most proteins are constructed in the

In the u. s., about what percentage of all food expenditures is now accounted for by meals eaten out?

Which gas is a source of natural groundwater pollution im thinking its carbon

How many atoms of each element are in the chemical formula p2 O5

Organisms that have groups of specialized cells organized into organs are always

What is a cell how does it effect the body

A farmer crossed a yellow maize plant (Yy) with another yellow maize plant (YY). He planted 200 seeds from this cross. How many of the plants would be yellow?